Add reusable loading skeletons with ARIA labels for Weather Dashboard (Fixes #13)

[Priya-creates]

This PR adds reusable loading skeleton components to the Weather Dashboard for improved UX while data is being fetched.

Image for review

Key changes:

• Created a reusable component with customizable width and height.
• Replaced plain placeholders for temperature, humidity, and description with skeletons.
• Added ARIA labels to skeletons for better accessibility.
• Ensures consistent look and accessibility during loading states.

Fixes: #13

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